ASSESSMENT OF REPRODUCIBILITY OF GEOMETRIC DISTORTION IN MRI USING PHANTOM MEASUREMENTS

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ASHKANMEHR M.; RIYAHI ALAM N.; OGHABIAN M.A.; GHASEMZADEH ALI; BAKHTIARI MORTEZA; GHANAATI H.; HASHEMI HASAN; PAKRAVAN MANIZHEH; SHAKERI N.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2005 | Volume:2 | Issue:8 Page(s): 1-8

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Title

ASSESSMENT OF REPRODUCIBILITY OF GEOMETRIC DISTORTION IN MRI USING PHANTOM MEASUREMENTS

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Keywords

MRIQ2

GEOMETRIC DISTORTIONQ4

PHANTOM MEASUREMENTSQ3

REPRODUCIBILITYQ2

Abstract

Introduction: Image distortion is one of the major problems of magnetic resonance imaging (MRI) for use in 3DMRI, velocity MRI, FMRI and radiotherapy treatment planning (RTTP). It is widely known that the most obvious effect of the in homogenity of the magnetic fields and the nonlinearity of the gradient is the GEOMETRIC DISTORTION of MR tomograms. In this study, the accuracy of MR images was considered by the phantom study and the REPRODUCIBILITY of images was evaluated by repeating the PHANTOM MEASUREMENTS. Materials and Methods: MRI scans of the phantom with grid pattern inside it were performed using head coil in two 1.5 Tesla MRI systems (picker VISTA TM HPQ, USA & GE Signa Echo Speed, USA). For the GEOMETRIC DISTORTION REPRODUCIBILITY evaluation the T1W, T2W and PDW SE protocols were repeated three times. The GEOMETRIC DISTORTION was measured by an edge, detection program in MATLAB.Results: The GEOMETRIC DISTORTION in the peripheral area of the images tends to be generally larger than it in the central area in all images. The average displacement in Picker MRI was 3 pixels in the y and 1pixel in the x direction and in GE MRI it was 1pixel in both x and y direction for 24 cm FOV (pixel = 0.9mm).Discussion and Conclusions: Since the positional variation was within 1 to 3 pixels for the head coil, it will be possible to use this MR system in 3DMRI, velocity MRI, FMRI and RTTP. To decrease the GEOMETRIC DISTORTION the use of suitable coil and protocol are expected.

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APA: Copy

ASHKANMEHR, M., RIYAHI ALAM, N., OGHABIAN, M.A., GHASEMZADEH, ALI, BAKHTIARI, MORTEZA, GHANAATI, H., HASHEMI, HASAN, PAKRAVAN, MANIZHEH, & SHAKERI, N.. (2005). ASSESSMENT OF REPRODUCIBILITY OF GEOMETRIC DISTORTION IN MRI USING PHANTOM MEASUREMENTS. IRANIAN JOURNAL OF MEDICAL PHYSICS, 2(8), 1-8. SID. https://sid.ir/paper/96960/en

Vancouver: Copy

ASHKANMEHR M., RIYAHI ALAM N., OGHABIAN M.A., GHASEMZADEH ALI, BAKHTIARI MORTEZA, GHANAATI H., HASHEMI HASAN, PAKRAVAN MANIZHEH, SHAKERI N.. ASSESSMENT OF REPRODUCIBILITY OF GEOMETRIC DISTORTION IN MRI USING PHANTOM MEASUREMENTS. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2005;2(8):1-8. Available from: https://sid.ir/paper/96960/en

IEEE: Copy

M. ASHKANMEHR, N. RIYAHI ALAM, M.A. OGHABIAN, ALI GHASEMZADEH, MORTEZA BAKHTIARI, H. GHANAATI, HASAN HASHEMI, MANIZHEH PAKRAVAN, and N. SHAKERI, “ASSESSMENT OF REPRODUCIBILITY OF GEOMETRIC DISTORTION IN MRI USING PHANTOM MEASUREMENTS,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 2, no. 8, pp. 1–8, 2005, [Online]. Available: https://sid.ir/paper/96960/en

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